Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfba94d5f4d46260…

MALICIOUS

PDF

93.3 KB Created: 2021-06-29 07:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a7e88b38f42d9219ca2ef8a981ba69d SHA-1: 7dafe88bd7a3c546c3b3b5c3248f74bab2924b34 SHA-256: cfba94d5f4d4626068ed9bf965091cad00fdfa06fc420dc71391d5a8e8d793ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV also strongly indicated maliciousness, specifically classifying it as a phishing trojan. The embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e79b634174---52306220795.pdf
    • http://www.mmalappeenranta.com/tiedostot/files/fekatafolasazur.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/061b62bba9d9cb31a43bf7972d01d35a/1892222991.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb51ee4e40---29295306269.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816a7240d34---29740954174.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a79107197a9---14177013930.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/u7rl7b3tsj558tutdo94m6vkjs/76429209401.pdf
    • http://broadmoor79.com/clients/864886/File/gezuvopisefezajobuza.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160781f9dac88f---47057198436.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607427a088ed6---47545904938.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd2782cd6---43326056223.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75b04e6050---38422689586.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609478740715f---99951153895.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf106a3c9---pozufibawudapisud.pdf
    • http://ahkkpcm.org/userfiles/lebarokizifomipuzekabuwi.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e59e23d445e2e23b6fc250fadbde762a/kixomip.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/fe41b0e3de79643a1e9e9f91f93355c2/fibesifitu.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cf784d3d063---9954523188.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a00b74f1137---6339548981.pdf
    • http://naitikfashions.com/ckfinder/userfiles/files/48220798355.pdf
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/20713054886.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3bd1f313d---kurosoponuturufoz.pdf
    • https://proxus.nl/file/zodugoromikolizenataruwi.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844ee1b781b---14797890293.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/m7fc3b82l203t9t25cq0u2jdk3/jobezidebexedipebujo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=meaning+of+appearances+are+deceptive
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001073f.bin
27478b78012c1942b108ea29942da75b863c063c08b016579ba8cb2fcc0a93e2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1073F 25964 bytes
font_00_sfnt_off0000da01.bin
b03527f2024c81facc4cd536a9c04a7b59dfa3ce0fa7cf2471f4779faf04b411		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 17408 bytes
font_02_sfnt_off00013627.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13627 16792 bytes
font_03_sfnt_off00014e3e.bin
b2a1f81c04c7431e4fb1fc56829d647adb5e06d40cf16ccabc82368fefb432a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3E 10808 bytes

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